feat: Implement BolsaLocalWidget and configure API CORS

frontend/src/components/BolsaLocalWidget.tsx

@@ -0,0 +1,94 @@
+import {
+  Box,
+  CircularProgress,
+  Alert,
+  Table,
+  TableBody,
+  TableCell,
+  TableContainer,
+  TableHead,
+  TableRow,
+  Paper,
+  Typography,
+  Tooltip
+} from '@mui/material';
+import type { CotizacionBolsa } from '../models/mercadoModels';
+import { useApiData } from '../hooks/useApiData';
+import ArrowUpwardIcon from '@mui/icons-material/ArrowUpward';
+import ArrowDownwardIcon from '@mui/icons-material/ArrowDownward';
+import RemoveIcon from '@mui/icons-material/Remove'; // Para cambios neutros
+
+// Función para formatear números
+const formatNumber = (num: number) => {
+  return new Intl.NumberFormat('es-AR', {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+  }).format(num);
+};
+
+// Componente para mostrar la variación con color e icono
+const Variacion = ({ value }: { value: number }) => {
+  const color = value > 0 ? 'success.main' : value < 0 ? 'error.main' : 'text.secondary';
+  const Icon = value > 0 ? ArrowUpwardIcon : value < 0 ? ArrowDownwardIcon : RemoveIcon;
+  
+  return (
+    <Box component="span" sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center', color }}>
+      <Icon sx={{ fontSize: '1rem', mr: 0.5 }} />
+      <Typography variant="body2" component="span" sx={{ fontWeight: 'bold' }}>
+        {formatNumber(value)}%
+      </Typography>
+    </Box>
+  );
+};
+
+export const BolsaLocalWidget = () => {
+  const { data, loading, error } = useApiData<CotizacionBolsa[]>('/mercados/bolsa/local');
+
+  if (loading) {
+    return <Box sx={{ display: 'flex', justifyContent: 'center', p: 4 }}><CircularProgress /></Box>;
+  }
+
+  if (error) {
+    return <Alert severity="error">{error}</Alert>;
+  }
+
+  if (!data || data.length === 0) {
+    return <Alert severity="info">No hay datos disponibles para el mercado local en este momento.</Alert>;
+  }
+
+  return (
+    <TableContainer component={Paper}>
+      <Table size="small" aria-label="tabla bolsa local">
+        <TableHead>
+          <TableRow>
+            <TableCell>Símbolo</TableCell>
+            <TableCell align="right">Precio Actual</TableCell>
+            <TableCell align="right">Apertura</TableCell>
+            <TableCell align="right">Cierre Anterior</TableCell>
+            <TableCell align="center">% Cambio</TableCell>
+          </TableRow>
+        </TableHead>
+        <TableBody>
+          {data.map((row) => (
+            <TableRow key={row.ticker} hover>
+              <TableCell component="th" scope="row">
+                <Typography variant="body2" sx={{ fontWeight: 'bold' }}>{row.ticker}</Typography>
+              </TableCell>
+              <TableCell align="right">${formatNumber(row.precioActual)}</TableCell>
+              <TableCell align="right">${formatNumber(row.apertura)}</TableCell>
+              <TableCell align="right">${formatNumber(row.cierreAnterior)}</TableCell>
+              <TableCell align="center">
+                <Variacion value={row.porcentajeCambio} />
+              </TableCell>
+            </TableRow>
+          ))}
+        </TableBody>
+      </Table>
+       <Tooltip title={`Última actualización: ${new Date(data[0].fechaRegistro).toLocaleString('es-AR')}`}>
+        <Typography variant="caption" sx={{ p: 1, display: 'block', textAlign: 'right', color: 'text.secondary' }}>
+            Fuente: Yahoo Finance
+        </Typography>
+      </Tooltip>
+    </TableContainer>
+  );
+};